216312518 has 8 divisors (see below), whose sum is σ = 331372512. Its totient is φ = 105855016.

The previous prime is 216312497. The next prime is 216312533. The reversal of 216312518 is 815213612.

216312518 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×216312518² = 93582210887000648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1150505 + ... + 1150692.

It is an arithmetic number, because the mean of its divisors is an integer number (41421564).

Almost surely, 2^216312518 is an apocalyptic number.

216312518 is a deficient number, since it is larger than the sum of its proper divisors (115059994).

216312518 is a wasteful number, since it uses less digits than its factorization.

216312518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301246.

The product of its digits is 2880, while the sum is 29.

The square root of 216312518 is about 14707.5666920127. The cubic root of 216312518 is about 600.2892290737.

The spelling of 216312518 in words is "two hundred sixteen million, three hundred twelve thousand, five hundred eighteen".